#include <jpgimage.hpp>
Inheritance diagram for Exiv2::JpegImage:
Public Member Functions | |
Creators | |
JpegImage (BasicIo::AutoPtr io, bool create) | |
Constructor that can either open an existing Jpeg image or create a new image from scratch. If a new image is to be created, any existing data is overwritten. Since the constructor can not return a result, callers should check the good() method after object construction to determine success or failure. | |
Accessors | |
std::string | mimeType () const |
Return the MIME type of the image. | |
Protected Member Functions | |
Accessors | |
bool | isThisType (BasicIo &iIo, bool advance) const |
Determine if the content of the BasicIo instance is of the type supported by this class. | |
Manipulators | |
int | writeHeader (BasicIo &oIo) const |
Writes a Jpeg header (aka signature) to the BasicIo instance. | |
Friends | |
bool | isJpegType (BasicIo &iIo, bool advance) |
Check if the file iIo is a JPEG image. |
Exiv2::JpegImage::JpegImage | ( | BasicIo::AutoPtr | io, | |
bool | create | |||
) |
Constructor that can either open an existing Jpeg image or create a new image from scratch. If a new image is to be created, any existing data is overwritten. Since the constructor can not return a result, callers should check the good() method after object construction to determine success or failure.
io | An auto-pointer that owns a BasicIo instance used for reading and writing image metadata. Important: The constructor takes ownership of the passed in BasicIo instance through the auto-pointer. Callers should not continue to use the BasicIo instance after it is passed to this method. Use the Image::io() method to get a temporary reference. | |
create | Specifies if an existing image should be read (false) or if a new file should be created (true). |
std::string Exiv2::JpegImage::mimeType | ( | ) | const [inline, virtual] |
Return the MIME type of the image.
Implements Exiv2::Image.
bool Exiv2::JpegImage::isThisType | ( | BasicIo & | iIo, | |
bool | advance | |||
) | const [protected, virtual] |
Determine if the content of the BasicIo instance is of the type supported by this class.
The advance flag determines if the read position in the stream is moved (see below). This applies only if the type matches and the function returns true. If the type does not match, the stream position is not changed. However, if reading from the stream fails, the stream position is undefined. Consult the stream state to obtain more information in this case.
iIo | BasicIo instance to read from. | |
advance | Flag indicating whether the position of the io should be advanced by the number of characters read to analyse the data (true) or left at its original position (false). This applies only if the type matches. |
Implements Exiv2::JpegBase.
int Exiv2::JpegImage::writeHeader | ( | BasicIo & | oIo | ) | const [protected, virtual] |
Writes a Jpeg header (aka signature) to the BasicIo instance.
oIo | BasicIo instance that the header is written to. |
Implements Exiv2::JpegBase.